months, as the government reaches its debt ceiling and can't borrow any more money. president obama wants to lift that ceiling. the republicans don't. and it appears we're heading for another "thelma and louise" ride to the edge. remember -- they went over. we'll discuss that possibility next week with paul krugman, the nobel laureate in economics and "new york times" columnist whose bestselling book, "end this depression now!" calls for full employment as an alternative to austerity. read it, then send us the question you would like me to put to paul krugman. meanwhile, another reality beckons and there's a menace more threatening than the fiscal cliff ever was. what should really be scaring the daylights out of us -- the crisis which could make all the others irrelevant -- is global warming. get this one wrong and it's over -- not just for the usa, but for planet earth. that's the message delivered by hurricane sandy, and by almost all the extreme weather of the past two years. and here in the first month of the new year, it's the message from the most informed scientists in the world.